Core-making machine



DE FOREST W. CANDLER GORE MAKING MACHINE Filed Dec. 27, 1926 5 Sheets-$heat i 6 1 INVENTOR 17.5 FOREST w. Efl/VDL [R BY Feb. 26, 1929.

DE FOREST w. CANDLE?! CORE MAKING MACHINE Filed Dec. 27, 1926 3 Sheets-Sheet 2 11V VEN TOR 25/081 37 w. e muu ER ORNE Y Feb. 26, 1929.

1,703,708 DE FOREST w. CANDLER CORE BAKING MACHINE Filed Uec. 27, 1926 3 Sheets-Sheet 3 R y NE R m m m H -U"NJITED STATES PATENT lli] rentermm or nanon, time, assrexoa me man, nomr, of BR3011311081653.

, ecan-sumo The object of this invention is to provide improved means for making sand cores with com ressed air.

T e s ecific object is'to devise means of repeate y filling a. core box by forcing a charge 0 sand, therein by means of comressed air, exactly as a shell isv propelled rom a gun, and thereby getting a core of uniform density and consistency. The difiiculty experienced with the apparatus now 3 plane 2-2;

in use is that the sand is not ejected uniformly. For example, referring to the patent to Anderson, #1,573,436, the receptacle from which the sand is ejected by air pressure is quite large, having a capacit equal to quite a number ofcores, and a though' this is a convenience because it requires to be refilled onl after a number of cores have cheaper the device can be operated, and

been made, t e action has been found in practice to be quite irre ular due to the sand packing in the receptac e, and sometimesf'the consumption of air in proportion to the sand ejected was large, and at other times the cores were incompletelyformed, and atall times the production of cores was unsatisfactory, as the de ee to which the sand was compressed varie with the amount of sand contained in the chamber or hopper. The lower the sand sank in the hopper the more efiectivebacame the packing effect of the compressed air in the core box, but the greater'the air loss. The more sand that can-be ejected for a given amount of air the from one point of view the efliciency of the device can be measured by the amount of sand ejected er cubic foot of compressed air consum A- compromise solution, which gave the bestv cores for the least money, was therefore sought.

- I have discovered that y increasing the length, decreasing forming the mout as well as by restricting the volume of sand in the cylinder thus formed to the amount of sand necessary to fill one core, lus a reasonable mar 'n of safety, I am a le to'eject the sand with the minimum consumption of compressed air and to produce cores with the least labor cost; In other words, I eject the, sand from.

the device very much as a shell is ejected from a un and thus every charge isejected under ike conditions, which renders the quality of the product uniform and'control; a e.

cylinder in which the ratio of bore 1e the diameter, properly By 'ng -oscillatin means to facilimg of this e ongated cylinder, 1

per to be as- Figure 3 shows a plan view taken on the plane 3-3 of Figure 2.

Fi ure 4 shows a plan view looking-upwarsonFi rel.

Figure 5 s taken on the lane 55 of Figure 1.

Figure 6 s ows a partial cross sectional elevation taken on1the plane 66 of. Figure 1, showing the elongated cylinder and core box in position, the position of the cylinder assumed when it is being refilled.

Figures 7 8', 9, and 10 show the. automatic means for vibrating the table upon. which the core box is mounted to facilitate the filling of the core box.

ows a cross sectional plan view at the entire the broken lines indicating In Figures 1 and 6, 1 is the elongated I h is approximately 5 to 1. This cylin er is mounted so as to oscillate freely on. trunnions 2 2. These trunnions are su rted. in slots 3 3' of the brackets 4 4, who permit the c linder a limited movement in a vertical direction. These brackets 4 4 are bolted to a frame 55, which is part of the machine. The cylinder 1 is provided with a handle 6 so that it can be freely oscillated on the trunnions 2. Compressed air is supplied through a pie 7 manually controlled y a valve 8, who admits air to the vertical pipe 9 connected with the horizontal 'pipe 10 and. the vertical :pipe '11. This admits air'to the mouth piece 12, see Fi re 4. This mouth piece 12 serves to distribute the air uniformly into the cylinder 1, there being eight'openings in the distributor. A groove or lip 13 is provided to the mouth piece 12. T is fits into a corresponding lip 14 on the end of the cylinder 1. It is important that-this joint should be reasonably close as otherwise the loss of compresed air therethrough will be considerable.

To the lower end ofthe c linder there is bolted a mouth piece 16, see 'gure 5. The

1 is full of sand, of sue a consistency that "is also curved and which has its mesa piece 15 is provided with two butlots. 16 16, formed by a. triangular hardened steel'pie'ce 17 which is arranged to be easily replaceable. (See Fig. 6.)

The corebox 21 has an opening 22 adaptthe lip 13, an adjusts le guide is provided as shown in Figure 3,'co mpr1sing three adjustable stops. 18 mounted on a suitable bracket 19, see Figure 2. The slight amount of unbalance provided by the lip 15 ensures that the cylinder 1 will contact with the rear stop 1'2. The bracket 19 carrying these stops 13 is supported by 4, 4, which also support the cylinder 1-,.see Figures 1 and 2.

Figure 6 also shows the general arrangement of the entire mechanism. A table 34 is arranged which servesas a support for the core box 21. A piston 23, sliding in a cylinder 2%, is ada ted to raise and lower this table 34 by t e application of compressed a'win a well known manner. In order that the core box shall-be filled with out any unnecessary manual labor, at the left of the table 34, a vibrator 39 is provided. 7

In Figures 7, 8, 9, and '10 the details of this vibrator are shown in detail. 7

To the cylinder 24, in which slides the piston 23, a cnrved bracket 31 is attached. (See Figure 8.} This bracket is suitably curved so as to contact with lever 32 which iulcrum on the valve33, which-valve 33 is bolted by the bolts 27 to the cylinder 23 by means.

of the bracket 25 provided with a slot 26 see 1 es 6, 7, and 8), and which there- 'ore moves with the cable 34. The valve 33 is thus unseated whenever the bracket 31 strikes the lever 32, when the table 34 rises. This admits compressed air from the pi e 29 and connection 30 to the pipe 38,

w' 'ch is connected to the vibrator 39, which is bolted to the table 3 1, see Figures 6, 9, and 10. The compressed air is admitted to the valve 33 from the hose 28 connected with the piping 29. {Figs 7 and 8.)

- Operation:-Assum1n that the cylinder r it is maintained full despite the openings 'justed by having 16 16 of Figure 1, which of course 1s ada suitable binder or body to the send, and by the shape of the replaceable piece 17 (Figs. 1 and 6), the core box 21 is placed on the table 34 and aligned with the cylinder by means of the lip 40, Compressed air is admitted to'the cylinder 24, which the piston 23 and table 34,

andthus makes a tightconnection (13-14) for the compressed air flowing cy der 1.

As the piston 23 forces the core box 21 into engagement with the sand, cylinder 1,

from the -pi es 9, 10, 11 and distributor 12 into the compressed air is admitted to the valve 33 by means of the stationary cam 31, which engages with the curvedlever 32, thus open' ing the-valve 33 andadmitting compressed air from the pipes 28, 29 through the Jpipe t e 38 to the vibrator 39. Thevibration 0 table 34 thus takes place simultaneously with the filling oi the core box, located on the table and ensures the complete filling of the core ox 21 without any rapping of thepbox by the operator.

Meanwhile compressed air, admitted past the valve 8 throughthe pipes 9 10, down 11, past the distributor 12, is forcing the send out of the cylinder 1, just as a bullet is propelled from a gun by the explosion of. the charge. The sand, thus propelled, sweeps ast the replaceable triangular piece of bar ened steel 17, which divides the stream of sand intotwo equal streams, and which distributes the. sand uniforml in the core box 21. By the means herein disclosed a very substantial increase in the rate of production of cores has been achieved.

The exact method of operating the device, from the operators point of view, is as follows The mechanic lines up the core box 21 with the cylinder 1, causing 15 to engage with 4.0. He then admits air to the cylinder 24, by means of a valve (not shown) operated by his right foot. This, of course, starts the vibrator 39 in operation. He then, with his left hand, opens the valve 8, admitting compressed air from 7 to the piping-8, 9, 10, and 11, where it is distributed at 12 and thus discharges the sand from the cylinder 1. He releases the pressure in 24, the table 34 falls by gravity, he removes the core box and rocks the cylinder 1 into the position shown in Figure 6, in broken lines, and then refills, either b hand or from a sand chute (not shown The cycle of operation is then repeated.

An automatic hopper, not shown, may be ap lied to the machine, so that upon oscillating the cylinder 1 the cylinder is automatically refilled with sand.

What I claim is:-

1. In a core blowing device, comprising a moveable table, a core box located thereon, a substantially vertical cylinder adapted to contain one charge of sand, and to engage with said core box, means for supporting said cylinder so that it is free to move in a vertical direction, means for admitting compressed air to the upper part of said cylinder, whereby on the admis. ion of compressed air-the substantially entire contents into eng area-roe thereof is discharged into and core box, means for oscillating said cylinderon a horizontal axis to facilitate the refilling of said cylinder between each operation.

' mitting compressed air to the upper end of said cylinder, thereby discharging sand from said cylinder intosaid core box from i the lower end.

3. A core making device, comprising a moveable table, a core box having a mouth in: its upper portion adapted to rest on said table, -a .moveable oscillating elongated cylinder containing sand, the lower end of which is adapted to engage with said core box and su ported above said table, a hollow fixed a utment adapted to engage with and to make a tight connection with the upper end of -said cylinder, means for raising the table, core box, and cylinder, whereby the cylinder is clamped between the abutment and the 'core box, means for admitting, compressed air through said abutment toeject the sand'into said core box.

4. A core making device, comprising a moveable table, a core box having a mouth finits upper portion adapted to rest on said table, a moveable oscillating elongated cylinder conta' sand, the lower end of which is adap to engage with said core box and sulgported above-said table, a fixed abutment pted to engage with the upper end of said cylinder, means'for raising the table, oorebox, and cylinder, whereby the cylinder is. clam and the core box, means for admitting compressed air through'said abutment to eject between the abutment the sand into said oore'box' means, operable by raising the table, for vi rating the table dpring the period-the cylinder is clamped in P 5. In a core blowing device, comprising a moveable table, a core box located thereon, a cylinder adapted to contain one charge of sand and to en 'with said core box, means r supporting said cylinder so that it is' free to move m a vertical direction means for clamping said cylinder to said core box, means' for admittmlgncompressed air to the upggpart of said=cy depywhereby on the a 'ssionvof compressed air the substantially entire contents thereof is discharged into said core box, means for oscillat' said cylinder one horizontal axis to facihtate the refilling'of said cylinder between each operation.

DE FonEs'r 

